Weighing scale



FIG. 1 is a front elevational view of a weighing scale showing my new design;

FIG. 2 is a left side elevational view, the right side being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top, front, and right side perspective view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view. 

The ornamental design for a weighing scale, as shown and described. 